How to Create Android Update Zip Package | All About Web & Mobile Application Development: "There are several ways to install applications or library files to an Android Phone. You can use Market application to find and install or adb command line tool to install or push the files to Android file system. These are all easy to implement for single file but if you have several applications or library files to install at once, it might be better to use update zip file. The update zip file is Android advanced system to install applications or lib files to Android file system using recovery tool. This method is commonly used by rom or theme developers to distribute their package.

Creating an update zip file is quite easy, all you have to do is put the files in corresponding directory in Android file system and an update-script file to copy the files."